Re: [GRASS-user] Simulation in grass 6
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HamishB
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Rainer M. Krug wrote:
> I am planning to write a spatial simulation model, simulating the spread > of alien species on a landscape scale by using grass. > My question how I should write the simulation model, i.e. in which > scripting language. I am using Linux and have quite a bit of experience > with R, so I thought that R (together with spgrass6) would be a nice > scripting language to write the simulation and sending the grass > commands through to grass, because it offers me quite a bit more > concerning strtucturing on the modelling side then using a normal shell > script > But the simulation should also run under Windows and I don't have any > experience with grass and R under windows. It sounds very well suited for Linux or MacOSX, but I've little idea about the GRASS+R Windows situation. Maybe someone on the statsgrass mailing list knows? (taking the liberty to cc) > I have the following questions: .. > 3) Is any other scripting language more suitable for what I want to > achieve (I have no experience with C / C++, but quite a bit with Delphi. > I have never used the likes of perl et al. and bash scrips seem a bit > awkward to me for bigger projects.)? You could try python. The next version of GRASS will use python heavily for the GUI, so expect lots of example scripts, help on the mailing list from fellow travelers, and tight integration with the code. Learn python in 10 min: http://www.poromenos.org/tutorials/python Also there is a SWIG/Python interface to any needed GIS library functions, which is pretty cool, although the grass modules generally give you what you need without having to resort to using any low-level libgis functions. see http://grass.gdf-hannover.de/wiki/GRASS_and_Python http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/ Hamish ____________________________________________________________________________________ Luggage? GPS? Comic books? Check out fitting gifts for grads at Yahoo! Search http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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Rainer M. Krug-2
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Hamish wrote:
> Rainer M. Krug wrote: > >> I am planning to write a spatial simulation model, simulating the spread >> of alien species on a landscape scale by using grass. >> My question how I should write the simulation model, i.e. in which >> scripting language. I am using Linux and have quite a bit of experience >> with R, so I thought that R (together with spgrass6) would be a nice >> scripting language to write the simulation and sending the grass >> commands through to grass, because it offers me quite a bit more >> concerning strtucturing on the modelling side then using a normal shell >> script >> But the simulation should also run under Windows and I don't have any >> experience with grass and R under windows. > > It sounds very well suited for Linux or MacOSX, but I've little idea about the > GRASS+R Windows situation. Maybe someone on the statsgrass mailing list knows? > (taking the liberty to cc) Thanks a lot - I am subscribed to this list now - strange that I overlooked that lisat before... > >> I have the following questions: > .. >> 3) Is any other scripting language more suitable for what I want to >> achieve (I have no experience with C / C++, but quite a bit with Delphi. >> I have never used the likes of perl et al. and bash scrips seem a bit >> awkward to me for bigger projects.)? > > You could try python. The next version of GRASS will use python heavily for the > GUI, so expect lots of example scripts, help on the mailing list from fellow > travelers, and tight integration with the code. Sounds very interesting - I'll take a look at it. > > Learn python in 10 min: http://www.poromenos.org/tutorials/python Python doesn't look as difficult as I thought the first time I looked at it (a few years back...). Looks similar to what I am used to in Delphi. > > Also there is a SWIG/Python interface to any needed GIS library functions, > which is pretty cool, although the grass modules generally give you what you > need without having to resort to using any low-level libgis functions. > > see http://grass.gdf-hannover.de/wiki/GRASS_and_Python Looking at the document, I must say it seems to be a usefull approach to use Python - and it is crossplatform. One thing which I did not see that quickly is how I can execute grass commands from python - I guess it is easy, but I didn't find it when I looked at the document. Thanks a lot for your usefull and very helpfull hints, Rainer > http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/ > > Hamish > > > > ____________________________________________________________________________________ > Luggage? GPS? Comic books? > Check out fitting gifts for grads at Yahoo! Search > http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz > > _______________________________________________ > grassuser mailing list > [hidden email] > http://grass.itc.it/mailman/listinfo/grassuser -- NEW EMAIL ADDRESS AND ADDRESS: [hidden email] [hidden email] WILL BE DISCONTINUED END OF MARCH Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Plant Conservation Unit Department of Botany University of Cape Town Rondebosch 7701 South Africa Tel: +27 - (0)21 650 5776 (w) Fax: +27 - (0)86 516 2782 Fax: +27 - (0)21 650 2440 (w) Cell: +27 - (0)83 9479 042 Skype: RMkrug email: [hidden email] [hidden email] _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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Agustin Lobo-2
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In reply to this post
by HamishB
Actually, I often use R as an scripting language
for grass. The problem is that grass commands have to be issued using system(), which, for a complex code, becomes inconvenient (lots of paste() for generating the actual grass command). Not being an expert at all on python, I wonder if making R able of executing grass commands without having to use system() could not be a valid alternative to python, at least in some cases. Anyway, I think that the real solution would be having a GIS able of displaying R objects, sort of RGis. Agus Hamish escribió: > Rainer M. Krug wrote: > >> I am planning to write a spatial simulation model, simulating the spread >> of alien species on a landscape scale by using grass. >> My question how I should write the simulation model, i.e. in which >> scripting language. I am using Linux and have quite a bit of experience >> with R, so I thought that R (together with spgrass6) would be a nice >> scripting language to write the simulation and sending the grass >> commands through to grass, because it offers me quite a bit more >> concerning strtucturing on the modelling side then using a normal shell >> script >> But the simulation should also run under Windows and I don't have any >> experience with grass and R under windows. > > It sounds very well suited for Linux or MacOSX, but I've little idea about the > GRASS+R Windows situation. Maybe someone on the statsgrass mailing list knows? > (taking the liberty to cc) > >> I have the following questions: > .. >> 3) Is any other scripting language more suitable for what I want to >> achieve (I have no experience with C / C++, but quite a bit with Delphi. >> I have never used the likes of perl et al. and bash scrips seem a bit >> awkward to me for bigger projects.)? > > You could try python. The next version of GRASS will use python heavily for the > GUI, so expect lots of example scripts, help on the mailing list from fellow > travelers, and tight integration with the code. > > Learn python in 10 min: http://www.poromenos.org/tutorials/python > > Also there is a SWIG/Python interface to any needed GIS library functions, > which is pretty cool, although the grass modules generally give you what you > need without having to resort to using any low-level libgis functions. > > see http://grass.gdf-hannover.de/wiki/GRASS_and_Python > http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/ > > Hamish > > > > ____________________________________________________________________________________ > Luggage? GPS? Comic books? > Check out fitting gifts for grads at Yahoo! Search > http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz > > _______________________________________________ > statsgrass mailing list > [hidden email] > http://grass.itc.it/mailman/listinfo/statsgrass > -- Dr. Agustin Lobo Institut de Ciencies de la Terra "Jaume Almera" (CSIC) LLuis Sole Sabaris s/n 08028 Barcelona Spain Tel. 34 934095410 Fax. 34 934110012 email: [hidden email] http://www.ija.csic.es/gt/obster _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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Rainer M. Krug-2
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Agustin Lobo wrote:
> Actually, I often use R as an scripting language > for grass. The problem is that grass commands have > to be issued using system(), which, for a complex code, > becomes inconvenient (lots of paste() for generating the > actual grass command). This is indeed a hassle, but I wrote a small R function which is pasting all the parameters supplied together and executing them via system() - still not perfect, but it works nicer then the system(paste(...)) approach. > Not being an expert at all on python, I wonder > if making R able of executing grass commands without > having to use system() could not be a valid alternative > to python, at least in some cases. I think this would, at least, make using grass from R much easier. And it shouldn't be to dificult to do that - just defining a function with the same name as in R and execute it via system() - I think about using this in my simulation. Thanks, Rainer > > Anyway, I think that the real solution would be having a GIS > able of displaying R objects, sort of RGis. > > Agus > > Hamish escribió: >> Rainer M. Krug wrote: >> >>> I am planning to write a spatial simulation model, simulating the >>> spread of alien species on a landscape scale by using grass. >>> My question how I should write the simulation model, i.e. in which >>> scripting language. I am using Linux and have quite a bit of >>> experience with R, so I thought that R (together with spgrass6) would >>> be a nice scripting language to write the simulation and sending the >>> grass commands through to grass, because it offers me quite a bit >>> more concerning strtucturing on the modelling side then using a >>> normal shell script >>> But the simulation should also run under Windows and I don't have any >>> experience with grass and R under windows. >> >> It sounds very well suited for Linux or MacOSX, but I've little idea >> about the >> GRASS+R Windows situation. Maybe someone on the statsgrass mailing >> list knows? >> (taking the liberty to cc) >> >>> I have the following questions: >> .. >>> 3) Is any other scripting language more suitable for what I want to >>> achieve (I have no experience with C / C++, but quite a bit with >>> Delphi. I have never used the likes of perl et al. and bash scrips >>> seem a bit awkward to me for bigger projects.)? >> >> You could try python. The next version of GRASS will use python >> heavily for the >> GUI, so expect lots of example scripts, help on the mailing list from >> fellow >> travelers, and tight integration with the code. >> >> Learn python in 10 min: http://www.poromenos.org/tutorials/python >> >> Also there is a SWIG/Python interface to any needed GIS library >> functions, >> which is pretty cool, although the grass modules generally give you >> what you >> need without having to resort to using any low-level libgis functions. >> >> see http://grass.gdf-hannover.de/wiki/GRASS_and_Python >> http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/ >> >> Hamish >> >> >> >> >> ____________________________________________________________________________________ >> >> Luggage? GPS? Comic books? Check out fitting gifts for grads at Yahoo! >> Search >> http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz >> >> _______________________________________________ >> statsgrass mailing list >> [hidden email] >> http://grass.itc.it/mailman/listinfo/statsgrass >> > -- NEW EMAIL ADDRESS AND ADDRESS: [hidden email] [hidden email] WILL BE DISCONTINUED END OF MARCH Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Plant Conservation Unit Department of Botany University of Cape Town Rondebosch 7701 South Africa Tel: +27 - (0)21 650 5776 (w) Fax: +27 - (0)86 516 2782 Fax: +27 - (0)21 650 2440 (w) Cell: +27 - (0)83 9479 042 Skype: RMkrug email: [hidden email] [hidden email] _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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jgarcia-2
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In reply to this post
by Agustin Lobo-2
I don't know if this will help you.
Just thinking about your reasons to use windows, maybe it's because you need to execute some windows program. My solution is to use R-GRASS in Linux for simulation, what is excellent beacuse of the wealth of R functions for statistical evaluation of the models, and the matrix operations in R. Also you can call C compiled code from your R script to speed up bottlenecks in your code, as pieces with a lot of loopings etc. And if you need to execute some windows program, you can also execute them remotely in a windows machina via ssh and get bak your results to your linux machine. This also works right. Good luck Javier ---------------------------------------- Agustin Lobo wrote: > Actually, I often use R as an scripting language > for grass. The problem is that grass commands have > to be issued using system(), which, for a complex code, > becomes inconvenient (lots of paste() for generating the > actual grass command). > Not being an expert at all on python, I wonder > if making R able of executing grass commands without > having to use system() could not be a valid alternative > to python, at least in some cases. > > Anyway, I think that the real solution would be having a GIS > able of displaying R objects, sort of RGis. > > Agus > > Hamish escribió: >> Rainer M. Krug wrote: >> >>> I am planning to write a spatial simulation model, simulating the >>> spread of alien species on a landscape scale by using grass. >>> My question how I should write the simulation model, i.e. in which >>> scripting language. I am using Linux and have quite a bit of >>> experience with R, so I thought that R (together with spgrass6) >>> would be a nice scripting language to write the simulation and >>> sending the grass commands through to grass, because it offers me >>> quite a bit more concerning strtucturing on the modelling side then >>> using a normal shell script >>> But the simulation should also run under Windows and I don't have >>> any experience with grass and R under windows. >> >> It sounds very well suited for Linux or MacOSX, but I've little idea >> about the >> GRASS+R Windows situation. Maybe someone on the statsgrass mailing >> list knows? >> (taking the liberty to cc) >> >>> I have the following questions: >> .. >>> 3) Is any other scripting language more suitable for what I want to >>> achieve (I have no experience with C / C++, but quite a bit with >>> Delphi. I have never used the likes of perl et al. and bash scrips >>> seem a bit awkward to me for bigger projects.)? >> >> You could try python. The next version of GRASS will use python >> heavily for the >> GUI, so expect lots of example scripts, help on the mailing list from >> fellow >> travelers, and tight integration with the code. >> >> Learn python in 10 min: http://www.poromenos.org/tutorials/python >> >> Also there is a SWIG/Python interface to any needed GIS library >> functions, >> which is pretty cool, although the grass modules generally give you >> what you >> need without having to resort to using any low-level libgis functions. >> >> see http://grass.gdf-hannover.de/wiki/GRASS_and_Python >> http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/ >> >> Hamish >> >> >> >> >> ____________________________________________________________________________________ >> >> Luggage? GPS? Comic books? Check out fitting gifts for grads at >> Yahoo! Search >> http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz >> >> _______________________________________________ >> statsgrass mailing list >> [hidden email] >> http://grass.itc.it/mailman/listinfo/statsgrass >> > -- Javier García-Pintado Institute of Earth Sciences Jaume Almera (CSIC) Lluis Sole Sabaris s/n, 08028 Barcelona Phone: +34 934095410 Fax: +34 934110012 e-mail:[hidden email] [jgarcia.vcf] begin:vcard fn;quoted-printable:Javier Garc=C3=ADa-Pintado n;quoted-printable:Garc=C3=ADa-Pintado;Javier org;quoted-printable:Institute of Earth Sciences Jaume Almera (CSIC)=0D=0A= adr;dom:;;Lluis Sole Sabaris s/n, 08028 Barcelona email;internet:[hidden email] tel;work:+34 934095410 tel;fax:+34 934110012 version:2.1 end:vcard _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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Michael Barton
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In reply to this post
by HamishB
Ranier,
On 9/25/07 2:02 AM, "Hamish" <[hidden email]> wrote: > Rainer M. Krug wrote: > >> I am planning to write a spatial simulation model, simulating the spread >> of alien species on a landscape scale by using grass. >> My question how I should write the simulation model, i.e. in which >> scripting language. I am using Linux and have quite a bit of experience >> with R, so I thought that R (together with spgrass6) would be a nice >> scripting language to write the simulation and sending the grass >> commands through to grass, because it offers me quite a bit more >> concerning strtucturing on the modelling side then using a normal shell >> script >> But the simulation should also run under Windows and I don't have any >> experience with grass and R under windows. You might want to take a look at the wildfire modeling routines already in GRASS. I think that with minimal work, these could be modified to become general spread-modeling routines. I've used these (with some difficulty) to model the spread of other phenomena than wildfires and would love to have general spread routines in GRASS. > > It sounds very well suited for Linux or MacOSX, but I've little idea about the > GRASS+R Windows situation. Maybe someone on the statsgrass mailing list knows? > (taking the liberty to cc) > >> I have the following questions: > .. >> 3) Is any other scripting language more suitable for what I want to >> achieve (I have no experience with C / C++, but quite a bit with Delphi. >> I have never used the likes of perl et al. and bash scrips seem a bit >> awkward to me for bigger projects.)? > > You could try python. The next version of GRASS will use python heavily for > the > GUI, so expect lots of example scripts, help on the mailing list from fellow > travelers, and tight integration with the code. > > Learn python in 10 min: http://www.poromenos.org/tutorials/python > > Also there is a SWIG/Python interface to any needed GIS library functions, > which is pretty cool, although the grass modules generally give you what you > need without having to resort to using any low-level libgis functions. > > see http://grass.gdf-hannover.de/wiki/GRASS_and_Python > http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/ > > Hamish I also want to second Hamish's mention of Python. It is a powerful and (relatively) easy to learn language that will become increasingly important to GRASS in the future. Extensions scipy and numpy give it additional abilities. Michael > > > > > ______________________________________________________________________________ > ______ > Luggage? GPS? Comic books? > Check out fitting gifts for grads at Yahoo! Search > http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz > > __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics & Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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Rainer M. Krug-2
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In reply to this post
by jgarcia-2
javier garcia-pintado wrote:
> I don't know if this will help you. > Just thinking about your reasons to use windows, maybe it's because you > need to execute some windows program. No - I am absolutely happy with Linux and would prefer to not have to think about windows any more - but there is always somebody who is paying you, in my pase the one who contracted us. They want to use it finally under windows... Rainer SNIP -- NEW EMAIL ADDRESS AND ADDRESS: [hidden email] [hidden email] WILL BE DISCONTINUED END OF MARCH Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Plant Conservation Unit Department of Botany University of Cape Town Rondebosch 7701 South Africa Tel: +27 - (0)21 650 5776 (w) Fax: +27 - (0)86 516 2782 Fax: +27 - (0)21 650 2440 (w) Cell: +27 - (0)83 9479 042 Skype: RMkrug email: [hidden email] [hidden email] _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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Rainer M. Krug-2
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In reply to this post
by jgarcia-2
javier garcia-pintado wrote:
> I don't know if this will help you. > Just thinking about your reasons to use windows, maybe it's because you > need to execute some windows program. No - I am absolutely happy with Linux and would prefer to not have to think about windows any more - but there is always somebody who is paying you, in my pase the one who contracted us. They want to use it finally under windows... Rainer SNIP -- NEW EMAIL ADDRESS AND ADDRESS: [hidden email] [hidden email] WILL BE DISCONTINUED END OF MARCH Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Plant Conservation Unit Department of Botany University of Cape Town Rondebosch 7701 South Africa Tel: +27 - (0)21 650 5776 (w) Fax: +27 - (0)86 516 2782 Fax: +27 - (0)21 650 2440 (w) Cell: +27 - (0)83 9479 042 Skype: RMkrug email: [hidden email] [hidden email] _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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Rainer M. Krug-2
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In reply to this post
by Michael Barton
Michael Barton wrote:
> Ranier, > > > On 9/25/07 2:02 AM, "Hamish" <[hidden email]> wrote: > >> Rainer M. Krug wrote: >> >>> I am planning to write a spatial simulation model, simulating the spread >>> of alien species on a landscape scale by using grass. >>> My question how I should write the simulation model, i.e. in which >>> scripting language. I am using Linux and have quite a bit of experience >>> with R, so I thought that R (together with spgrass6) would be a nice >>> scripting language to write the simulation and sending the grass >>> commands through to grass, because it offers me quite a bit more >>> concerning strtucturing on the modelling side then using a normal shell >>> script >>> But the simulation should also run under Windows and I don't have any >>> experience with grass and R under windows. > > You might want to take a look at the wildfire modeling routines already in > GRASS. I think that with minimal work, these could be modified to become > general spread-modeling routines. I've used these (with some difficulty) to > model the spread of other phenomena than wildfires and would love to have > general spread routines in GRASS. Good idea - I haven't thought about them. I'll see what I can do with them. > >> It sounds very well suited for Linux or MacOSX, but I've little idea about the >> GRASS+R Windows situation. Maybe someone on the statsgrass mailing list knows? >> (taking the liberty to cc) >> >>> I have the following questions: >> .. >>> 3) Is any other scripting language more suitable for what I want to >>> achieve (I have no experience with C / C++, but quite a bit with Delphi. >>> I have never used the likes of perl et al. and bash scrips seem a bit >>> awkward to me for bigger projects.)? >> You could try python. The next version of GRASS will use python heavily for >> the >> GUI, so expect lots of example scripts, help on the mailing list from fellow >> travelers, and tight integration with the code. >> >> Learn python in 10 min: http://www.poromenos.org/tutorials/python >> >> Also there is a SWIG/Python interface to any needed GIS library functions, >> which is pretty cool, although the grass modules generally give you what you >> need without having to resort to using any low-level libgis functions. >> >> see http://grass.gdf-hannover.de/wiki/GRASS_and_Python >> http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/ >> >> Hamish > > I also want to second Hamish's mention of Python. It is a powerful and > (relatively) easy to learn language that will become increasingly important > to GRASS in the future. Extensions scipy and numpy give it additional > abilities. > > Michael > >> >> >> >> ______________________________________________________________________________ >> ______ >> Luggage? GPS? Comic books? >> Check out fitting gifts for grads at Yahoo! Search >> http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz >> >> > > __________________________________________ > Michael Barton, Professor of Anthropology > Director of Graduate Studies > School of Human Evolution & Social Change > Center for Social Dynamics & Complexity > Arizona State University > > phone: 480-965-6213 > fax: 480-965-7671 > www: http://www.public.asu.edu/~cmbarton > > -- NEW EMAIL ADDRESS AND ADDRESS: [hidden email] [hidden email] WILL BE DISCONTINUED END OF MARCH Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Plant Conservation Unit Department of Botany University of Cape Town Rondebosch 7701 South Africa Tel: +27 - (0)21 650 5776 (w) Fax: +27 - (0)86 516 2782 Fax: +27 - (0)21 650 2440 (w) Cell: +27 - (0)83 9479 042 Skype: RMkrug email: [hidden email] [hidden email] _______________________________________________ statsgrass mailing list [hidden email] http://grass.itc.it/mailman/listinfo/statsgrass |
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